CN103045188B - Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof - Google Patents
Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof Download PDFInfo
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- CN103045188B CN103045188B CN201310013191.0A CN201310013191A CN103045188B CN 103045188 B CN103045188 B CN 103045188B CN 201310013191 A CN201310013191 A CN 201310013191A CN 103045188 B CN103045188 B CN 103045188B
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Abstract
The invention relates to a plugging-type filtrate reducer for water-based drilling fluid and a preparation method thereof. The filtrate reducer can be selected in accordance with different well section temperatures and strata characteristics, and comprises polymer modified oxidized asphalt (PMA), a modifying agent and an auxiliary filtrate reducer; and the filtrate reducer series samples can be prepared by a simple surface modification and dry-blending process. The sample disclosed by the invention is excellent in performance of reducing filtrate of the drilling liquid with the reducing rate of 80%, a dense and tough mud cake is formed, and the crack and fracture of the strata can be plugged in real time based on high-temperature softening and deforming characteristic of the asphalt; an appropriate product formula can be selected depending on the applied strata characteristics and well section temperatures; and the plugging-type filtrate reducer for the water-based drilling fluid is flexile to use, simple in production process, moderate in condition, high in production efficiency, low in cost, free from waste and dust, and low in harm on the body of an operator.
Description
Technical Field
The invention belongs to oil field chemicals used in a water-based drilling fluid system, and particularly relates to a plugging type filtrate reducer used in a water-based drilling fluid and a preparation method thereof.
Background
The functions of the water-based drilling fluid mainly comprise the following aspects: the drilling fluid is used for carrying rock debris, cooling a drilling tool, plugging and preventing collapse, reducing water loss, lubricating a drill bit, transmitting information, assisting in rock breaking, balancing and controlling formation pressure and the like, wherein the reduction of the filter loss of the drilling fluid entering a formation is one of the main aspects. The fluid loss agent, also called fluid loss agent and fluid loss control agent, can form a filter cake with low permeability, flexibility, thinness and compactness on the well wall, and is a kind of oilfield chemicals which can reduce the fluid loss of the drilling fluid as much as possible. Filtrate reducers are mainly classified into the following categories: cellulose, humic acid, acrylic polymer, resin and starch.
The fiber products comprise sodium carboxymethyl cellulose, polyanionic cellulose, sodium carboxyethyl cellulose and the like, for example, the product of US20100828061 has excellent filtrate loss reduction performance and wide application system range, but the product obviously improves the viscosity of the drilling fluid, and has high price and poor temperature resistance.
Humic acid products comprise lignite lye, sodium nitrohumate, chromium humic acid, sulfomethyl lignite and the like, for example, Chinese patent CN1807543 and CN9411858.5, the products can reduce filtration loss and viscosity at the same time, have certain temperature resistance, but the filtrate pollutes the environment and damages oil and gas reservoirs, the production process conditions are harsh, and the products have great physical damage to operators.
The acrylic polymer comprises hydrolyzed polyacrylonitrile ammonium salt, polyacrylate polymer and the like, acrylate multipolymer and the like, such as Chinese patent CN99100025.0, Chinese patent CN101250397, Australian patent AU2010207511 and world patent WO2011158003, the product has the functions of resisting salt, thickening and improving cutting simultaneously, so that shale expansion is inhibited, the process is simple, but the calcium resistance of the product is weaker, the temperature resistance of the product is poor, and the raw material and the product have sour taste.
The resin products comprise sulfomethyl phenolic resin, sulfonated lignite resin, sulfonated lignin sulfomethyl phenolic resin condensate and the like, such as Chinese patents CN99107926.4, CN99107925.6 and CN200710114554.4, and the resin products have good high-temperature resistance, lubricating property and anti-collapse property, but relatively poor filtration loss performance and environmental pollution.
Starch products include carboxymethyl starch, carboxypropyl starch, pregelatinized starch, high temperature resistant starch, modified starch and the like, for example, Chinese patent CN201010125334.3, and the products belong to natural polymers and derivatives thereof, are easy to degrade and have good environmental protection performance, but the products have poor high temperature resistance, complex modification process and easy fermentation and deterioration, and cannot be used and stored for a long time.
In addition, some researchers have used the plugging property of fibrous or block materials to prepare fluid loss additives, such as chinese patents CN200810236644.5 and CN200710014322, which are innovative, but their fluid loss reducing performance is inferior to that of high molecular and resin products, and their high temperature resistance is also limited.
Disclosure of Invention
Aiming at the defects of the existing research and the urgent need of practical application, in particular to the problems of viscosity increasing, complex production process, environmental pollution, high cost and the like existing in the existing filtrate reducer for water-based drilling fluid, the invention aims to solve the problem of providing a plugging-type filtrate reducer for water-based drilling fluid and a preparation method thereof.
The plugging type fluid loss additive obtained by the method has excellent performance of reducing the fluid loss of drilling fluid, the reduction rate is as high as 80%, compact and tough mud cakes are formed, and the high-temperature softening deformation characteristic of asphalt can plug formation cracks and fractures in time. In addition, an appropriate product formula can be selected according to the characteristics of an applied stratum and the temperature of a well section, the use is flexible, the production process is simple, the conditions are mild, the production efficiency is high, the cost is low, no waste gas or dust is generated, and the harm to the body of an operator is small.
Therefore, according to the first aspect of the present invention, there is provided a preparation method of a plugging type fluid loss additive for a water-based drilling fluid, comprising the following steps:
(1) weighing the following components in parts by weight: 40-90 parts of asphalt, 2-10 parts of surface modifier and 0-58 parts of separant;
(2) spraying a surface modifier on the asphalt component in the stirring process;
(3) crushing the material obtained in the step (2), preferably in a blast pulverizer, wherein the mesh number of the crushed sample is 80-200 meshes;
(4) and (3) after crushing and discharging, feeding the crushed material into a dry mixer, preferably feeding the crushed material into the dry mixer through a pump, adding the separant in the ratio, starting the dry mixer for dry mixing, preferably for 20min-2 h, preferably for 30min-1 h, discharging to obtain the plugging type fluid loss additive, and optionally bagging and storing the plugging type fluid loss additive.
According to the invention, the asphalt component is one or more of polymer modified asphalt oxide (PMA), natural asphalt and asphalt oxide;
the surface modifier may be a mixture of a cationic surfactant and a water-soluble silicone oil (OSO-W). The cationic surfactant functions to make the asphalt component a hydrophilic material. The cationic surfactant is quaternary ammonium salt cationic surfactant, preferably Cetyl Trimethyl Ammonium Chloride (CTAC), Cetyl Trimethyl Ammonium Bromide (CTAB) or mixture thereof in any proportion. The water-soluble silicone oil (OSO-W) has the function of stabilizing the water dispersibility of the asphalt component and accelerating the soaking time of the asphalt component. The water-soluble silicone oil is water-soluble silicone oil OSO-w produced by Beijing Youmettner nano material Co.
According to the invention, the weight ratio of the cationic surfactant to the water-soluble silicone oil OSO-w is as follows: 1-5: 1-10, preferably 1-3: 1 to 7, more preferably 1 to 2: 1 to 5.
As used herein, the term "release agent," also referred to as a barrier agent, refers to a solid powder component with an auxiliary fluid loss additive, including cellulose grafted starch (EPPS), polyacrylonitrile ammonium salt (NH)4PAN), poly (acrylonitrile-acrylamide) ammonium salts (bis-ammonium salts) (HMP-21), lignite resins (SPNH), sulfonated lignite (SMC), sulfonated phenolic resins (SMP), or mixtures thereof in any proportion. The lignite resin is preferably a sulfonated lignite resin. Any of them may be usedOne kind or any mixture of two or more kinds. The amount of the release agent is preferably 2 to 58 parts, more preferably 5 to 50 parts, and still more preferably 10 to 40 parts.
According to a preferred embodiment of the present invention, as the release agent, cellulose modified starch, lignite resin, poly (acrylonitrile-acrylamide) ammonium salt is used.
According to a preferred embodiment of the invention, the components and the weight ratio thereof are as follows: 40-80 parts of polymer modified oxidized asphalt, 4-10 parts of surface modifier, 0-40 parts of cellulose modified starch, 0-40 parts of ammonium salt of bi-poly acrylonitrile, 0-40 parts of sulfonated lignite resin, and 2-58 parts of the total amount of the cellulose modified starch, the ammonium salt of bi-poly acrylonitrile and the sulfonated lignite resin.
According to a second aspect of the invention, the plugging type fluid loss additive for the water-based drilling fluid prepared by the method is characterized in that the following components are weighed according to the weight ratio: 40-90 parts of asphalt, 2-10 parts of surface modifier and 0-58 parts of separant.
The asphalt component is one or more of polymer modified asphalt oxide (PMA), natural asphalt and asphalt oxide.
The surface modifier is a mixture of a cationic surfactant and a water-soluble silicone oil (OSO-W). The cationic surfactant is quaternary ammonium salt cationic surfactant, preferably Cetyl Trimethyl Ammonium Chloride (CTAC), Cetyl Trimethyl Ammonium Bromide (CTAB) or mixture thereof in any proportion. The water-soluble silicone oil can be water-soluble silicone oil OSO-w produced by Beijing Youmettner nano materials GmbH. The weight ratio of the cationic surfactant to the water-soluble silicone oil OSO-w is as follows: 1-5: 1-10, preferably 1-3: 1 to 7, more preferably 1 to 2: 1 to 5.
The release or barrier agent comprises cellulose grafted starch (EPPS), polyacrylonitrile ammonium salt (NH)4PAN), poly (acrylonitrile-acrylamide) ammonium salt (bis-ammonium salt) (HMP-21), lignite resin (SPNH), sulfonated lignite (SMC), sulfonated phenolAldehyde resins (SMP) or mixtures thereof in any proportion. The lignite resin is preferably a sulfonated lignite resin.
According to the invention, cellulose-modified starch, lignite resin or poly (acrylonitrile-acrylamide) ammonium salts are preferably used as release agents. Further preferably, the components and the weight ratio thereof are as follows: 40-80 parts of polymer modified oxidized asphalt, 4-10 parts of surface modifier, 0-40 parts of cellulose modified starch, 0-40 parts of ammonium salt of bi-poly acrylonitrile, 0-40 parts of sulfonated lignite resin, and 2-58 parts of the total amount of the cellulose modified starch, the ammonium salt of bi-poly acrylonitrile and the sulfonated lignite resin.
According to the invention, the water dispersion stability and the adhesion resistance of the asphalt material in the water-based drilling fluid can be improved by surface modification and addition of the solid powdery separant. In addition, by selecting different separant components and combinations thereof, the filtrate reducer with different high-temperature resistance and suitable plugging property of the stratum can be prepared.
According to one embodiment of the invention, cellulose-grafted starch (EPPS) and/or ammonium polyacrylonitrile (NH) salts are preferably used4PAN) is used as a separant, and the finally prepared plugging fluid loss additive can resist the high temperature of 120 ℃ and is suitable for shallow strata;
according to another embodiment of the invention, poly (acrylonitrile-acrylamide) ammonium salt (double ammonium salt) (HMP-21) and/or sodium carboxymethylcellulose (CMC) are preferably used as the release agent, and the finally prepared plugging fluid loss agent can resist high temperature of 150 ℃ and is suitable for middle and deep strata;
according to another embodiment of the invention, lignite resin (SPNH), sulfonated lignite (SMC) and/or sulfonated phenolic resin (SMP) are preferably used as the release agent, and the finally obtained plugging fluid loss additive can resist high temperature of 170 ℃ and is suitable for deep formations. The most suitable plugging fluid loss additive can be selected from the above exemplary products according to actual needs.
The plugging fluid loss additive for the water-based drilling fluid fully utilizes the characteristic of high-temperature softening deformation of an asphalt material, can form a layer of compact and tough mud cake, reduces the permeation quantity of the drilling fluid entering a stratum, and can be timely filled and cured when meeting stratum cracks and fractures, thereby stabilizing a well wall, playing the effects of plugging and preventing collapse, and solving the problems of drilling sticking and the like caused by well mouth shrinkage.
In addition, the plugging fluid loss additive for the water-based drilling fluid has the filtration loss reduction rate of over 80 percent, the high temperature resistance of 120-170 ℃, wide application range and good water dispersion stability, and can obtain the most suitable product which has different high temperature resistance and is suitable for stratum and can be selected according to actual requirements by surface modification and addition of a solid powdery isolating agent.
Detailed Description
The invention is further explained or illustrated by the following examples. The examples provided should not be construed as limiting the scope of the invention.
Evaluation of Performance
1. And (3) evaluating the appearance of the sample:
the samples were visually inspected at ambient temperature.
2. Fineness evaluation:
weighing 50.00g (weighing standard to 0.01 g) of the sample, putting the sample into a 30-mesh standard sieve, and quickly shaking the standard sieve until the sample does not leak down. And (4) weighing the mass of the screen residue, and calculating the fineness according to the formula (1).
In the formula:
s-fineness,%;
m1-mass of rejects, g;
m-weighing the sample mass, g.
3. Evaluation of Water Dispersion Rate:
100mL of distilled water is measured by using a 100mL measuring cylinder, 1.0g of sample is weighed and quickly poured into the measuring cylinder (the sample does not occupy the wall of the measuring cylinder), and timing is started at the same time to observe the time used for completely immersing the sample into the distilled water.
4. Evaluation of viscosity Properties:
taking 400mL of base slurry, slowly adding 20.0g of sample while stirring, stirring at a high speed for 20min, maintaining for 24h under a closed condition at room temperature, stirring at a high speed for 5min, measuring the viscosities phi 600, phi 300, phi 200, phi 100, phi 6 and phi 3 of the sample solution on a six-speed rotational viscometer according to the specification of GB/T16783.1-2006, and calculating the Apparent Viscosity (AV), the Plastic Viscosity (PV) and the dynamic shear force (YP).
AV=R600/2
PV=R600－R300
YP=(2R300－R600)×0.511
In the formula: AV-apparent viscosity, mPa · s;
PV-plastic viscosity, mPa · s;
YP-dynamic shear force, Pa.
5. Evaluation of filtrate loss reduction performance:
preparing base slurry of drilling fluid: taking 1000ml of tap water, adding 50g of sodium soil for drilling fluid test slowly under stirring, stirring at a high speed for 60min, stopping twice during stirring to scrape clay adhered to the wall of the container, and then maintaining the base slurry under a closed condition at room temperature for 24 h. The performance requirements of the base slurry are as follows: the API fluid loss was 25 mL. + -. 5mL, the HTHP (120 ℃ C.) fluid loss was 110 mL. + -. 10 mL. If the performance of the base slurry does not meet the requirement, the addition of the sodium soil can be proportionally adjusted.
(2) Measurement of API fluid loss: taking 400mL of base slurry, slowly adding 20.00g of sample while stirring, stirring at a high speed for 20min, maintaining at room temperature under a closed condition for 24h, stirring at a high speed for 5min, and then measuring the API (American Petroleum institute) filtration loss.
(3) Determination of HTHP120 ℃ fluid loss: taking 400mL of base slurry, slowly adding 20.0g of sample while stirring, stirring at a high speed for 20min, maintaining at room temperature under a closed condition for 24h, and measuring the filtration loss of HTHP (120 ℃, 3.5 MPa) after stirring at a high speed for 5 min.
(4) Measurement of HTHP120 ℃ filtrate loss after high-temperature hot rolling: taking 400mL of base slurry, slowly adding 20.00g of sample while stirring, stirring at a high speed for 20min, placing in a roller furnace, hot rolling at a constant temperature for 16h, taking out, cooling to room temperature, stirring at a high speed for 5min, and measuring the filtration loss of HTHP (120 ℃, 3.5 MPa).
Example 1
(1) Weighing 200kg of polymer modified asphalt oxide (PMA) and placing on the ground for artificial scattering;
(2) spraying 9kg of polyol ester nonionic surfactant Span80 and 9kg of polyol ester nonionic surfactant Tween80 during stirring to perform primary surface modification;
(3) transferring the material in the step (2) into a blast pulverizer for pulverizing;
(4) and discharging, pumping into a dry mixer, adding 80kg of cellulose modified starch into the dry mixer, performing dry mixing for 30min, discharging and bagging to obtain a sample, and marking as NFL-120.
The sample of example 1 was evaluated according to the above-described sample performance evaluation method, and the results are shown in fig. 1.
TABLE 1 EXAMPLE 1NFL-120 quality test results
Example 2
(1) Weighing 200kg of polymer modified asphalt oxide, placing the polymer modified asphalt oxide on the ground, and manually scattering the polymer modified asphalt oxide;
(2) spraying 6kg of industrial-grade liquid CTAB and 12kg of water-soluble silicone oil OSO-w in the stirring process to carry out primary surface modification;
(3) transferring the material in the step (2) into a blast pulverizer for pulverizing;
(4) and discharging, pumping into a dry mixer, adding 100kg of poly (acrylonitrile-acrylamide) ammonium salt (double-poly ammonium salt) (HMP-21) into the dry mixer, performing dry mixing for 30min, discharging and bagging to obtain a sample, wherein the sample is recorded as NFL-150.
The sample of example 2 was evaluated according to the above-described product performance evaluation method, and the results are shown in table 2.
TABLE 2 example 2NFL-150 quality test results
Example 3
(1) Weighing 200kg of polymer modified asphalt oxide, placing the polymer modified asphalt oxide on the ground, and manually scattering the polymer modified asphalt oxide;
(2) spraying 6kg of industrial-grade liquid CTAB and 12kg of water-soluble silicone oil OSO-w in the stirring process to carry out primary surface modification;
(3) transferring the material in the step (2) into a blast pulverizer for pulverizing;
(4) and discharging, pumping into a dry mixer, adding 45kg of lignite resin into the dry mixer, performing dry mixing for 30min, discharging and bagging to obtain a sample, and marking as NFL-170.
The sample of example 3 was evaluated according to the above-described sample performance evaluation method, and the results are shown in table 3.
TABLE 3 example 3NFL-170 quality test results
The present invention is described in detail with reference to the above-mentioned embodiments. It should be noted that the above embodiments are only for illustrating the present invention. Numerous alternatives and modifications can be devised by those skilled in the art without departing from the spirit and scope of the invention, which should be construed as within the scope of the invention.
Claims (13)
1. A preparation method of a plugging type filtrate reducer for water-based drilling fluid comprises the following steps:
(1) weighing the following components in parts by weight: 40-90 parts of asphalt, 2-10 parts of surface modifier and 2-58 parts of separant;
(2) spraying a surface modifier on the asphalt component in the stirring process;
(3) crushing the material obtained in the step (2), wherein the mesh number of the crushed sample is 80-200 meshes;
(4) after crushing and discharging, feeding the mixture into a dry mixer, adding the separant in the ratio, starting the dry mixer for dry mixing for 20min-2 h, discharging to obtain the plugging type filtrate reducer, and optionally bagging for storage;
wherein,
the asphalt component is one or more of polymer modified oxidized asphalt, natural asphalt and oxidized asphalt;
the surface modifier is a mixture of a cationic surfactant and water-soluble silicone oil (OSO-w);
the cationic surfactant is quaternary ammonium salt cationic surfactant;
the water-soluble silicone oil is water-soluble silicone oil (OSO-w) produced by Beijing Youmettner nano material company Limited;
the weight ratio of the cationic surfactant to the water-soluble silicone oil OSO-w is as follows: 1-5: 1 to 10.
2. The production method according to claim 1,
in the step (1), 6-50 parts by weight of a release agent is added;
the crushing method in the step (3) is carried out in a blast pulverizer;
in the step (4), the mixture enters a dry mixing machine through a pump and is mixed for 30min to 1 hour;
the cationic surfactant is Cetyl Trimethyl Ammonium Chloride (CTAC), Cetyl Trimethyl Ammonium Bromide (CTAB) or a mixture formed by any proportion of the Cetyl Trimethyl Ammonium Chloride (CTAC) and the Cetyl Trimethyl Ammonium Bromide (CTAB);
the weight ratio of the cationic surfactant to the water-soluble silicone oil OSO-w is as follows: 1-3: 1 to 7.
3. The production method according to claim 2,
in the step (1), 10-40 parts of a release agent by weight;
the weight ratio of the cationic surfactant to the water-soluble silicone oil OSO-w is as follows: 1-2: 1 to 5.
4. The production method according to claim 1,
the separant is cellulose grafted starch or polyacrylonitrile ammonium salt (NH)4PAN), poly (acrylonitrile-acrylamide) ammonium salt, lignite resin (SPNH), sulfonated lignite (SMC), sulfonated phenolic resin (SMP) or a mixture thereof in any proportion,
the lignite resin is sulfonated lignite resin.
5. The production method according to claim 1,
the separant is cellulose modified starch, lignite resin or poly (acrylonitrile-acrylamide) ammonium salt.
6. The production method according to claim 1,
the components and the weight ratio thereof are as follows: 40-80 parts of polymer modified oxidized asphalt, 4-10 parts of surface modifier, 0-40 parts of cellulose modified starch, 0-40 parts of ammonium salt of bi-poly acrylonitrile, 0-40 parts of sulfonated lignite resin, and 2-58 parts of the total amount of the cellulose modified starch, the ammonium salt of bi-poly acrylonitrile and the sulfonated lignite resin.
7. The plugging type fluid loss agent prepared by the method according to claim 1 is characterized by comprising the following components in parts by weight: 40-90 parts of asphalt, 2-10 parts of surface modifier and 2-58 parts of separant.
8. Plugging fluid loss additive according to claim 7,
the fluid loss agent comprises the following components in parts by weight: 40-90 parts of asphalt, 2-10 parts of surface modifier and 6-50 parts of separant.
9. Plugging fluid loss additive according to claim 8,
the fluid loss agent comprises the following components in parts by weight: 40-90 parts of asphalt, 2-10 parts of surface modifier and 10-40 parts of separant.
10. Plugging fluid loss additive according to claim 7,
the release agent comprises cellulose grafted starch and/or polyacrylonitrile ammonium salt (NH)4PAN)。
11. Plugging fluid loss additive according to claim 7,
the release agent comprises a poly (acrylonitrile-acrylamide) ammonium salt and/or sodium carboxymethylcellulose (CMC).
12. Plugging fluid loss additive according to claim 7,
the release agent comprises lignite resin (SPNH), sulfonated lignite (SMC) and/or sulfonated phenolic resin (SMP).
13. Use of a blocked fluid loss additive made according to the process of any one of claims 1 to 6 or a blocked fluid loss additive according to any one of claims 7 to 12 for water-based drilling fluids.
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| CN104403057B (en) * | 2014-11-21 | 2015-08-19 | 北京培康佳业技术发展有限公司 | Fluid loss additive for boring fluid and preparation method thereof and application |
| CN108504339A (en) * | 2018-03-26 | 2018-09-07 | 中国石油天然气集团有限公司 | A kind of water-base drilling fluid and its preparation method and application suitable for compact oil reservoir |
| CN109852353B (en) * | 2019-01-22 | 2021-03-16 | 北京宏勤石油助剂有限公司 | High-temperature-resistant fluid loss additive for drilling fluid and preparation method thereof |
| CN110699052B (en) * | 2019-10-11 | 2021-10-15 | 北京宏勤石油助剂有限公司 | Temperature-resistant salt-resistant fluid loss agent for drilling fluid and preparation method thereof |
| CN111154478B (en) * | 2020-01-14 | 2022-11-01 | 中国石油天然气股份有限公司 | Filtrate reducer for enlarging effective action distance of acid liquor and preparation method and application thereof |
| CN111560099A (en) * | 2020-06-23 | 2020-08-21 | 濮阳中原三力实业有限公司 | Composite fluid loss additive for well drilling and preparation method thereof |
| CN112029486B (en) * | 2020-11-03 | 2022-05-03 | 胜利油田钻井飞龙泥浆技术服务有限公司 | Preparation method of environment-friendly degradable high-temperature-resistant salt-resistant anti-collapse filtrate reducer |
| CN116333697B (en) * | 2022-12-30 | 2023-10-10 | 吐鲁番盛运工贸有限责任公司 | Method for preparing filtrate reducer for drilling fluid by using modified lignite resin |
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